Isokinetic bristle bundle brushes

ABSTRACT

A paintbrush having an elongated handle has a brush head containing a continuum of bristles configured from a multiplicity of primary short bristles and secondary longer bristles with split and smaller diameter distal extremities. The effect of the primary shorter bristles is to release coating liquid onto the longer bristles during bending. The effect of the distal end of the secondary longer bristles is to function as smoothing of the discharged coating in lieu of physical stroking requiring human muscular strain.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates generally to brushes used for applying coatings,containing bundles of bristles fixed to a distal end of a handle, andspecifically the bristles used for transferring the coating materialfrom the liquid contained as fluid bulk within a container, to deposit,disperse and smooth said liquid to an even thickness upon anarchitectural surface.

Surface coatings of paint, varnish, shellac, lacquer, and plasticformulations, utilize brushes (embodiments, commonly identified aspaintbrushes, of bristles arranged on the distal end of a handle).

2. Discription of the Prior Art

Manual brushes for applying coating materials are widely available in avariety of size, shapes and types with a wide assortment of bristlesmade from synthetic and animal hairs. Animal hairs are prescribed foruse on volatile coatings; synthetic hairs are used on water basedcoatings; a blend of various hairs is used for general purpose coatingmaterial. Animal hairs have split ends, each branch of dimensionallyfiner diameter than the stem. Synthetic hairs generally have thickerdiameter hairs, some bundles are wedge shaped at the contacting end.

Brushes with small amounts of coating are repeatedly stroked left-right,up-down, waved in random motions until the coating is spread andsmoothed. The spreading is accomplished in the earlier strokes withhuman controlled forces (isokinetically) while the smoothing isaccomplished in the later strokes with lighter human controlled forces(isokinetically) against the surface being coated.

OBJECTS OF THE INVENTION

A general object of the present invention is to provide a coating brushthat will decrease the physical strain expended to perform the strokingnecessary to effect spreading and smoothing of the coating materials.

A specific object of the invention is to provide an improved coatingbrush having a bristle arrangement that minimizes the human judgmentrequired to control physical forces.

SUMMARY OF THE INVENTION

An improved coating brush is provided with a specific arrangement ofbristles at the distal end of a handle for reduced human physicaleffort. The brush bristles include two or more types of bristle withspecific distal lengths relative to each other. The smaller diameter,split bristles protrude beyond the stiffer, synthetic bristles.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1. Is a side elevation view of two bristles depicting the bristledistal ends during a right-to-left stroke when forced against anarchitectural surface.

1. “A coating” brush “with” bristles, presented against an architecturalsurface simultaneously at lengths, maintained by the embodiment, suchthat finer hairs protrude longer than stiffer hairs.